Application of Double Current Bridge-Circuit for Simultaneous Measurements of Strain and Temperature

A four-terminal (4T) bridge-circuit unconventionally supplied by current sources connected in parallel to opposite arms, named double current bridge (2J) is presented. It has two different outputs from both diagonals. Their output voltages as the functions of arm resistance increments in absolute and in relative units are given. Example of its application is proposed. Signals conditioning formulas of the two-parameter (2D) measurement - of strain and temperature are discussed in details. Some results of experimentally design instrumentation of this bridge-circuit are shortly presented.